Should i go on the plane to israel to see my grand-parents?

i love them dont get me wrong but i am cluster phobic and i have fear of planes. just the thought of it makes me lose breath (i almost passed out) and i feel like throwing up and i feel dizzy. its an 18 hour flight and i dont know what to do. my mom wants me to come but at the same time she thinks its bad for my health. I DONT KNOW WHAT TO DO. HELP!!!!